Stepper exercise device



FIG. 1 is a perspective view of the new design for a stepper exercise device;

FIG. 2 is a front view of the new design;

FIG. 3 is a rear view of the new design;

FIG. 4 is a right side view of the new design;

FIG. 5 is a left side view of the new design;

FIG. 6 is a top view of the new design; and,

FIG. 7 is a bottom view of the new design.

The broken line showing of portions of the stepper exercise device depicts environment and forms no part of the claim. 

CLAIM The ornamental design for a stepper exercise device, as shown and described. 